jss how to change opacity for a color

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You can use RGBA values

const styleSheet = theme => ({
root: {
backgroundColor: 'rgba(255, 255, 255, 0.5)',
},
})

https://facebook.github.io/react-native/docs/colors.html

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I found a solution using

 backgroundColor: theme.utils.rgba(theme.axColor.black, 0.7),

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Alternatively, you can use the fade function provided in Material UI Next.

import {fade} from 'material-ui/styles/colorManipulator';


const theme = createMuiTheme({
overrides: {
MuiButton: {
root: {
boxShadow: `0 4px 8px 0 ${fade(defaultTheme.palette.primary[500], 0.18)}`,
}
},
}
});


export default theme;

Here's how it's working : https://github.com/mui-org/material-ui/blob/v1-beta/src/styles/colorManipulator.js#L157-L164

Another solution could be to use similar color functions from https://github.com/styled-components/polished

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最佳答案

Material UI has a colorManipulator utility file, which includes an alpha function:

import { alpha } from '@material-ui/core/styles/colorManipulator';


/**
* Sets the absolute transparency of a color.
* Any existing alpha values are overwritten.
* @param {string} color - CSS color, i.e. one of: #nnn, #nnnnnn, rgb(), rgba(), hsl(), hsla(), color()
* @param {number} value - value to set the alpha channel to in the range 0 - 1
* @returns {string} A CSS color string. Hex input values are returned as rgb
*/


{
backgroundColor: alpha(theme.colors.red, 0.5)
}

For Mui v5:

import { alpha } from "@mui/material";

Alternatively, you can add the color library from npm for color manipulation:

import Color from 'color';


{
backgroundColor: Color(theme.colors.red).alpha(0.5).string()
}

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For what it's worth, an 8 digit hex code works too

const styleSheet = theme => ({
root: {
backgroundColor: '#ffffff80',
},
})

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Assuming you don't already have the alpha channel defined in the color, you can also do:

backgroundColor: theme.colors.red + '00'

This will set alpha channel to 0, thus transparent. You can append any value between '00' to 'ff'

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Another possibility is:

import color from "color"


const themeColorsRed = color
.rgb(theme.colors.red)
.array()

Then you can do:

{
backgroundColor: `rgba(${themeColorsRed}, 0.05)`,
}

小开

Some of these answers are referencing deprecated Material-UI functions. The current preferred approach is to use alpha:

import { alpha } from "@material-ui/core";


...
// yields rgba(255,255,255,0.85)
backgroundColor: alpha(theme.palette.background.paper, 0.85)

小开

for MUI v5 this seems to work:

import { alpha } from '@mui/material';

...

MuiContainer: {
styleOverrides: {
root: {
'&.MuiContainer-asideWithImage': {
backgroundColor: alpha(MY_COLOR, 0.78),
},
},
},
},

...